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Pension and other benefits
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Pension and other benefits Pension and other benefits
During the three and nine months ended September 30, 2024, the Company made contributions to its defined benefit pension plans of $5 million and $10 million, respectively (three and nine months ended September 30, 2023 - $4 million and $13 million, respectively).

Net periodic benefit (recovery) cost for defined benefit pension plans and other benefits included the following components:        

For the three months ended September 30
PensionsOther benefitsTotal
(in millions of Canadian dollars)202420232024202320242023
Current service cost $21 $18 $3 $2 $24 $20 
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation116 122 6 5 122 127 
Expected return on plan assets(223)(220)— — (223)(220)
Recognized net actuarial loss10 8 — — 10 8 
Amortization of prior service costs2 — — — 2 — 
Total other components of net periodic benefit (recovery) cost(95)(90)6 5 (89)(85)
Net periodic benefit (recovery) cost$(74)$(72)$9 $7 $(65)$(65)
For the nine months ended September 30
PensionsOther benefitsTotal
(in millions of Canadian dollars)202420232024202320242023
Current service cost $63 $53 $9 $7 $72 $60 
Other components of net periodic benefit (recovery) cost:
Interest cost on benefit obligation350 365 18 16 368 381 
Expected return on plan assets(668)(661)— — (668)(661)
Recognized net actuarial loss30 24 — — 30 24 
Amortization of prior service costs5 1 — 1 5 2 
Total other components of net periodic benefit (recovery) cost(283)(271)18 17 (265)(254)
Net periodic benefit (recovery) cost$(220)$(218)$27 $24 $(193)$(194)